The counts you listed sound way, way off for some reason. What food counts book are you using, just out of curiosity??
All vegetables contain digestible carbohydrates over and above the fiber content. Even raw
bran has some extra carbs beyond its fiber content! It's possible that your book has already subtracted the fiber from the TOTAL carbs. So, for the celery example, the fiber is 6 gms, remaining digestible carb is 5 gms for a TOTAL carb count of 11 grams. Perhaps there's an index, or maybe in the front pages / introduction of the book, the author explains how the values are calculated.
One way to estimate the true carb content, is to look at the number of calories listed for the food. From that figure, subtract the calories of protein (4 calories per gm), then subtract calories of fat (9 cal. per gm). The remainder is the number of calories contributed by digestible carbohydrate. Divide that by 4, voila, you have the grams of carb in the food. Fiber won't be included in the calories, because it isn't digested.
Corrine Netzer's "the Complete Book of Food Counts" is excellent and accurate, and includes listings for thousands of foods, including brand names and fast food restaurants. The 2000 edition is $10 Cdn, paperback.
Also, the USDA on-line site is excellent, Wa'il has given the link above.
For the record, one stalk of celery has 6 calories, 0.3 gm protein, 1.5 gm carbs, 0.1 gm fat and 0.7 gm fiber.
hope this helps ..
Doreen